<!DOCTYPE html>
<html>
    <head>
        <title>CKEditor</title>
        <script src="//cdn.ckeditor.com/4.5.7/standard/ckeditor.js"></script>
    </head>
    <body>
        <textarea name="editor1" style="width:100%;height:100%"></textarea>
        <script>
            CKEDITOR.replace( 'editor1' );
        </script>
    </body>
</html>